TM 1-1520-240-104-4-2 capacity of 800 to 820 gallons of usable fuel and emptyweight of approximately 607 pounds (fig. 4-4-1). ERFSII tanks are designed to be loaded and unloaded by fourpersons (with restraint system in place) in no more than10 minutes and require no tools. The tanks should not beunloaded with any quantity of remaining fuel. When thetanks are installed there is an aisle up the right side of theaircraft which is approximately 25 inches wide. Theplumbing module consists of an aluminum access coversecured to an energy-absorbing aluminum tube or col-umn. The in-tank plumbing components are attached toa column in the center of the tank permitting easy remov-al and maintenance on components. A 75 psi fuel cap,dual transfer pumps, fuel quantity probe, fuel samplingtube, and a fuel pressure switch are the internal parts ofeach of the tanks. Refueling the ERFS II tanks is per-formed by either the helicopter Single Point RefuelingSystem or gravity.a.Fuel Hoses. An interconnecting fuel hose man-ifold connects the ERFS II tanks together. A two inchhose connected at the forward end of the ERFS II fuelmanifold is connected to the helicopter Single POINTRefueling System in the vicinity of STA 225 on the leftside of the cargo compartment. Fuel transfer hoses con-nected at the aft end of the manifold carry fuel to theaircraft fuel system quick disconnects at STA 380 on bothleft and right sides of the cargo compartment.CAUTIONUp to 4 OZ. of fuel can be trapped betweenthe closed “Dry Break” valves in the Uni-sex couplings. Care should be taken tominimize spillage of this trapped fuelwhen separating the couplings.b.Vent Hose Assembly. Aircraft overboard ventsand connections are installed on the left side of the cabinarea through the fuselage at STA 254.0, 330.0, and410.0. Overboard fuel vent caps must be removed any-time internal fuel tanks are installed. Vent hoses are con-nected to the tank vent line at the self-sealing breakawayvalve on the top of the tank assembly and one of the threeaircraft overboard vent connections.CAUTIONTrying to pressure refuel the tanks withoutconnecting the vent line could overpres-surize the tanks.The vent hose assembly allows the venting to atmo-sphere of fuel vapor, thus providing vent air to relieveinternal tank pressures. Fuel hoses and manifold areself-sealing incorporating Unisex couplings. Each Uni-sex coupling, ballcock valve, permits hose removal with-out fuel spillage. The manifold also provides connectionto the FARE pump module. The fuel/defuel valve is amanually operated vented valve that simultaneouslyopens a high flow rate fuel path in the fuel/defuel line, anda high flow rate vent path out of the tank. The valve mustbe open for pressure refueling of the tanks, FARE opera-tions, or suction defueling. An automatic fuel shutoffvalve, with dual high level shutoff controls is located in-side the tank. Inside each of the tanks is an open ventvalve to allow fuel to vent overboard in the event of highlevel shutoff valve failure.
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